Electrode for discharge tubes



Jan. 19 1926 K. A. LEBBINK ELECTRODE FOR DISCHARGE TUBES Filed July 5,1923 WWI YEW Patented Jan. 19, 1926.

UNITED STATES PATENT OFFICE.

KABEL AUGUST LEBIBINK, OF EINDHOVEN, NETHERLANDS, ASSIGNOR TO NAAI-LOOZE VENNOOTSCHAP PHILIPS GLOEILAMPENFABRIEKEN, OF EINDHOVEN.

NETHERLANDS.

ELECTRODE FOB DISCHARGE TUBES.

Application filed July 5, 1928. Serial No. 649,517. To all whom it mayconcem: tubes in wireless telegraphy or telephony.

Be it known that I, KAREL AUGUST LEB- In some cases it may be applicableas an on BINK, asubject of the Queen of the Netheranode but generally itis more adapted to lands, residing at Eindhoven, in the Provserve as agrid in tubes of the said kind.

ince of North Brabant, in the Kingdom of The invention will now bedescribed in the Netherlands, have invented certain new detail byreference to the accompanying and useful Improvements in or Relating todrawing. The said drawing represents on a on Electrodes for DischargeTubes, of which large scale a perspective view showing the the followingis a specification. wire helix embedded in the slots between the Thisinvention relates to electrodes for teeth 7 according to the invention.

electric discharge tubes, said electrodes be- The wire 6 may be of anysuitable ductile ing particularly ada ted for the grids of material.Tungsten, molybdenum or nickel c5 tubes provided with t ree or moreelectrodes. for example are suitable for the purpose.

It is known to make grids for three elec- The supports are preferably ofan easily trode tubes by Winding a wire of tungsten workable materialwhich is not brittle. for example in adjacent coils on a frame or Nickelhas proved to be suitable for the puron one or more supports orsupporting rods. pose. When bending the teeth between the In doing sothe successive coils should be slots no difficulty is encountered whenusing properly atlixed to the supporting rods to the said metal. preventdisplacement of the coils and the T o the left of line ab, the slots areshown practice is to effect this attachment by solas shaped beforeinserting the wire.

dering or welding or by lacing with a thin shown in the said figure theslots are cut in (a wire. under an angle smaller than 90. In a par- Thisknown process is laborious and theticular case an angle of cutting ofsay 25 attachment reahzed is in many cases unsatlsmay be suitable, butgenerally it depends on factory. the shape and size of the teeth andslots.

The present invention has for its principal When cutting the slots inthis manner, it an object to simplify and improve the manner is easierto bend the teeth such that they in which the coils are attached to thesuphold the wire in the slots.

ports so that an uniform and well-finished After the wire has beeninserted in the final product is easily ensured. slots, the teeth arebent and thus the con- The electrode according to the inventionstruction shown to the right of the line a-b 35 comprises a wire and atleast one support is realized, the wires 6 being locked between for saidwire, the wire being inserted in slots the teeth 7 and the bent ends 8.

35 provided in said supports and teeth lying The electrode according tothe invention between the slots being bent over so as to can be made invarious manners, for examlock the wire. Obviously the wire may also pleby first cutting the slots in one or various be shaped for example as aband. adjacent supports, whereupon the latter may According to anotherfeature of the inbe inserted in grooves of a mandril which vention andin order to facilitate the bendis adapted-to be inserted in a lathe. Ifthe ing of the teeth, the slots in the supports are supports areinserted and attached such preferably cut in under an angle which isthat the slots follow a helical line it is possismaller than 90. ble forthe wire to be quite easily wound In the manufacture of electrodesaccordfrom a reel on the supports. ing to the invention, the supports.may be Simpler is another process according to inserted in thelongitudinal grooves of a the invention by which the supports areinmandril, whereupon the slots are helicoiserted 'at once in the groovesof a mandril. 10o dally cut in the supports. The wire is then In themandril which is adapted 'to be inwound in the slots, the latter beingfinally serted in a lathe, longitudinal grooves are cut closed bybending the intermediate teeth. out, in which the supports are inserted,which The electrode according to the invention is for example areconnected together by a particularly adapted for use in dischargering.It will be apparent that the grooves tubes used as generating-tubes orreceiving in the mandril are provided in such amanner that the supportswill take up the 0- sition which they keep in the finished e ectrode.

The mandril with supports is tightened in a lathe and the slots are cutin the sup orts along a helical line by a travelling c isel, referablyunder an angle smaller than 90. he slots may also be sawn or hewed. ,1

Finally the bending of the teeth can be effected by careful hammering,by compres sion or by passing a hard object under ressure along thesupports or by heat, w ereby the teeth enclose the slots wholly or inart. p The roduct thus treated is slid as a whole from the mandril. Ifdesired, the supports are connected together by a second ring or a plateand the electrode is finished, the wire being so clamped as to make adisplacement during the operation of the electrode out of the uestion.

at I claim is:-

1. An electrode for electric discharge tubes comprising a wire and atleast one support for said wire, the wire being inserted 1n slotsprovided in said support and teeth lying between the slots being bentover so as to lock the wire.

2. An electrode for electric .discharge tubes comprising a coiled Wirewound on at least one su port, the windings of said wire being embe dedin slots and the teeth between said slots being bent over so as to lockthe windings.

3. An electrode for electric discharge tubes comprising a wire and atleast one support for said wire, the wire being inserted in slots beingcut in said support under an angle which is smaller than 90 and teethlying between the slots being bent over so as to lock the wire.

In testimony whereof I have hereunto set my hand thisleith day of June1923.

KAREL AUGUST LEBBINK.

